Journal of Integer Sequences, Vol. 13 (2010), Article 10.1.7

On a Compositeness Test for (2p+1)/3

Pedro Berrizbeitia
Departmento de Matemáticas Pura y Aplicada
Universidad Simón Bolívar
Caracas, Venezuela

Florian Luca
Instituto de Matemáticas
Universidad Nacional Autonoma de México
C.P. 58089, Morelia, Michoacán

Ray Melham
Department of Mathematical Sciences
University of Technology, Sydney
PO Box 123
Broadway, NSW 2007


In this note, we give a necessary condition for the primality of (2p+1)/3.

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(Concerned with sequence A000979.)

Received November 16 2009; revised versions received January 14 2010. Published in Journal of Integer Sequences, January 18 2010.

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